Redshifts of 31 radio galaxies are presented, as well as a qualitative description of their optical spectra. All but three of the galaxies observed have emission spectra; the strength of the emission is described by an index S6 No absorption lines have been found in the continuum of radio galaxies with strong emission. The last section contains a preliminary discussion of various optical and properties of the sources.
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Maarten Schmidt (1965) studied this question.